CN103983088A - System and method for predrying lignite and recycling water by using waste heat of power station - Google Patents
System and method for predrying lignite and recycling water by using waste heat of power station Download PDFInfo
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- CN103983088A CN103983088A CN201410213708.5A CN201410213708A CN103983088A CN 103983088 A CN103983088 A CN 103983088A CN 201410213708 A CN201410213708 A CN 201410213708A CN 103983088 A CN103983088 A CN 103983088A
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- bed dryer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The invention discloses a system and a method for predrying lignite and recycling water by using waste heat of a power station. After exhaust steam of a turbine is subjected to the heat exchange of a steam condenser, circulation water at the outlet of the condenser is divided into two parts; one part is conveyed to an air preheater for heating air, the heated air is used as a fluidizing agent of a fluidized bed dryer, air-water vapor mixed air exhausted from the fluidized bed dryer passes by the deduster, then enters an air condenser and the condensed water is comprehensively used; the other part of circulation water enters an internal heater of the fluidized bed dryer and provides heat for a drying process; the water drained from the air heat exchanger and the internal heater of the fluidized bed dryer is used as circulation cooling water. All of the heat comes from the circulation water of a cooling tower and other waste heat of the power station, so the heat loss and the evaporation capacity of the water content in the cooling tower are effectively reduced, the load of the cooling tower is reduced, and the power generation efficiency of the power station is obviously improved when the method is used as a process for predrying the lignite of the coal fired power station.
Description
Technical field
The present invention relates to power station used heat utilization and brown coal drying technical field, be specifically related to a kind of system and method that utilizes the predrying brown coal of power station used heat and moisture to reclaim.
Background technology
Brown coal outward appearance is brown or pitchy, contains higher moisture and volatile matter.The total moisture of brown coal is generally between 30～60%, and volatile matter content is generally higher than 40%.Brown coal rich content, cheap, there is good fire behaviour and burnout characteristic, be a kind of good power fuel and industrial chemicals, be mainly distributed in Eastern Inner Mongolia and the Northeast.Be unfavorable for long-distance transportation because brown coal moisture is high, the brown coal that simultaneously directly burn, make brown coal generating efficiency low, have hindered the application of brown coal in electricity generation system, therefore, and transport or the generating of burning brown coal again after conventionally brown coal being first dried.
At present, conventional brown coal drying technique comprises and adopts hot flue gas directly to heat and utilize the indirect whizzer drying brown coal of steam.The former,, because brown coal volatile matter is high, is subject to the impact of dry flue gas temperature, easily causes spontaneous combustion, and drier is bulky, and cost is high, and the dry disposal ability of unit volume is low; Drier moving component is many, and power consumption is large, and fragile.The latter need to be carried wet body, and energy consumption for drying is high, and single machine yield is little, needs multiple devices parallel connection for large-scale power station.Consider safety factor, needing increases ammonia gas generating device, prevents brown coal burning in dry run, and equipment investment is large.
The recirculated cooling water in power station is for condensing turbine steam discharge, for boiler provides feedwater.The hot water (common 50 DEG C of left and right) of condensator outlet is admitted to cooling tower, in cooling tower by with air heat-exchange, general temperature reduces by 11～12 DEG C of left and right, this part heat is directly discharged in atmosphere, it is a waste heat source of coal fired power plant, if can utilize fully this part heat, can effectively reduce cooling tower raw make up water amount and evaporation capacity.
Summary of the invention
The problem existing in order to solve above-mentioned prior art, the object of the present invention is to provide a kind of system and method that utilizes the predrying brown coal of power station used heat and moisture to reclaim, utilize the used heat of power station recirculated cooling water and other used heat to carry out predrying to brown coal, reclaim the moisture comprehensive utilization in brown coal simultaneously, there is dry coal output large, without the feature of spontaneous combustion risk, and improve generating efficiency.
In order to achieve the above object, the technical solution used in the present invention is:
A kind of system of utilizing the predrying brown coal of power station used heat and moisture to reclaim, comprise stram condenser 3, the air inlet of described stram condenser 3 is connected with the exhaust outlet of steam turbine 2, the delivery port of described stram condenser 3 is connected to flow controller 18, described flow controller 18 is controlled respectively the hot water amount who enters air heat exchanger 5 and the built-in heater of fluidized bed dryer 10, the gas outlet of described air heat exchanger 5 connects fluidized bed dryer 10 fluidizing agent entrances, the gas vent of described fluidized bed dryer 10 connects deduster 14 and aerial condenser 15, the coal export of described fluidized bed dryer 10 is connected with the entrance of coal pulverizer 13, the delivery port of described air heat exchanger 5 and fluidized bed dryer 10 is connected with the water inlet of cooling tower 8.
On the pipeline being connected with the built-in heater of fluidized bed dryer 10 at the delivery port of stram condenser 3, the first waste heat exchanger 12 is set, on the pipeline being connected with fluidized bed dryer 10 fluidizing agent entrances in the gas outlet of air heat exchanger 5, the second waste heat exchanger 9 is set, described the first waste heat exchanger 12 and the second waste heat exchanger 9 are for utilizing other waste heat source of power station.
The method that system described above utilizes the predrying brown coal of power station used heat and moisture to reclaim, described steam turbine 2 steam discharges are after stram condenser 3 heat exchange, the recirculated water that stram condenser 3 exports is divided into two parts: a part flows into air heat exchanger 5, air 7 is heated, and the air after heating is as the fluidizing agent of fluidized bed dryer 10; Another part recirculated water through the first waste heat exchanger 12 post bake laggard enter in the internal heater of fluidized bed dryer 10, for the dry run of brown coal raw material 11 provides heat, dried brown coal enter in coal pulverizer 13, enter cooling tower 8 as recirculated cooling water through the water of air heat exchanger 5 and fluidized bed dryer 10 built-in heat exchangers discharges; The air that fluidized bed dryer 10 discharges and water vapor mixture are after deduster 14 is removed bulky grain coal dust, gaseous mixture enters aerial condenser 15, air 16 is discharged from the top of aerial condenser 15, condensed water 17 comprehensive utilization from discharge aerial condenser 15 bottoms.
If also have other waste heat source in power station, by the first waste heat exchanger 12 and the second waste heat exchanger 9, water and air heated again respectively.
Compared to the prior art, tool has the following advantages in the present invention:
1, the heat that the present invention utilizes, completely from cooling water and power station used heat, can reduce heat loss and water evaporation quantity in cooling tower effectively, reduces cooling tower load, as the predrying technique of coal fired power plant brown coal, can significantly improve the generating efficiency in power station.In addition, the present invention can reclaim the moisture in brown coal effectively, and rich coal water-deficient area is had great importance.
2, the present invention is integrated, and the predrying system of brown coal separates and recovery system with aqueous vapor, can reclaim brown moisture in coal comprehensive utilization.
3, the present invention utilizes the energy source of power station used heat as fluidization air and drying brown coal, and its operating temperature is lower, and brown coal are without spontaneous combustion risk, and gas does not need protection.
4, utilize the first waste heat exchanger and the second waste heat exchanger again to heat the water and air entering in fluidized bed dryer, improve brown coal dewatering efficiency.
Brief description of the drawings
Accompanying drawing is the system schematic that the present invention utilizes the predrying brown coal of power station used heat and moisture to reclaim.
In figure: 1-boiler 2-steam turbine 3-stram condenser
4-boiler feed pump 5-air heat exchanger 6-air blower
7-air 8-cooling tower 9-the second waste heat exchanger
10-fluidized bed dryer 11-brown coal raw material 12-the first waste heat exchanger
13-coal pulverizer 14-deduster 15-aerial condenser
16-air 17-condensed water 18-flow controller
Detailed description of the invention
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
As shown in drawings, a kind of system of utilizing the predrying brown coal of power station used heat and moisture to reclaim of the present invention, comprise stram condenser 3, the air inlet of described stram condenser 3 is connected with the exhaust outlet of steam turbine 2, the delivery port of described stram condenser 3 is connected to flow controller 18, described flow controller 18 is controlled respectively the hot water amount who enters air heat exchanger 5 and the built-in heater of fluidized bed dryer 10, the gas outlet of described air heat exchanger 5 connects fluidized bed dryer 10 fluidizing agent entrances, the gas vent of described fluidized bed dryer 10 connects deduster 14 and aerial condenser 15, the coal export of described fluidized bed dryer 10 is connected with the entrance of coal pulverizer 13, the delivery port of described air heat exchanger 5 and fluidized bed dryer 10 is connected with the water inlet of cooling tower 8.
As the preferred embodiment of the present invention, on the pipeline being connected with the built-in heater of fluidized bed dryer 10 at the delivery port of stram condenser 3, the first waste heat exchanger 12 is set, on the pipeline being connected with fluidized bed dryer 10 fluidizing agent entrances in the gas outlet of air heat exchanger 5, the second waste heat exchanger 9 is set, described the first waste heat exchanger 12 and the second waste heat exchanger 9 are for utilizing other waste heat source of power station.
As shown in drawings, the superheated steam pushing turbine 2 that boiler 1 produces generates electricity, and steam turbine 2 steam discharges, after stram condenser 3 heat exchange, are sent into boiler 1 system by boiler feed pump 4 and produced steam.The recirculated water (approximately 50 DEG C) that stram condenser 3 exports is divided into two parts, a part heats air 7 through air heat exchanger 5, air (approximately 42 DEG C) after heating is as the fluidizing agent of fluidized bed dryer 10, if also have other waste heat source in power station, can continue through the second waste heat exchanger 9, this air to be heated again, then send into the fluidizing agent as brown coal drying in fluidized bed dryer 10; Another part recirculated water (approximately 50 DEG C) is sent in the built-in heater of fluidized bed dryer 10, if also have other waste heat source in power station, can continue through the first waste heat exchanger 12, this recirculated water to be heated again, then send in the built-in heater of fluidized bed dryer 10, for the dry run of brown coal raw material 11 provides heat, directly enter cooling tower 8 from the water of air heat exchanger 5 and fluidized bed dryer 10 internal heater discharges.
After fluidized bed dryer 10 is dry, part moisture in brown coal and fluidization air are discharged from fluidized bed dryer 10 with the form of air-water mixture, after deduster 14 is removed the coal grain that wherein particle diameter is larger, enter aerial condenser 15, after gas-water separation, air 16 directly enters in atmosphere, and condensed water 17 is comprehensive utilization from discharge air cooler bottom.
Taking the coal-fired power plant of 600MW as example, raw material brown coal As-received moisture content (M
ar) be 38.5%, adopt this system and method, build raw coal treating capacity 250th
-1the predrying system of brown coal, the moisture of brown coal can be down to 27.9% by 36.8%, removes in coal about 25% moisture.Calculate by theory, use the brown coal after partial dehydration, net boiler efficiency has improved 2.6%, and net heat flow improves 2.8%, and fuel quantity reduces 10.8%, and exhaust gas volumn reduces by 4%.Because coal flow reduces and grindability raising, coal pulverizer power-dissipation-reduced 17%, blower fan power-dissipation-reduced 3.8%, full factory power consumption has reduced by 3.8%, and meanwhile, the temperature of recirculated cooling water reduces approximately 10 DEG C, can reclaim the used heat of power plant 20%.
Claims (4)
1. a system of utilizing the predrying brown coal of power station used heat and moisture to reclaim, it is characterized in that: comprise stram condenser (3), the air inlet of described stram condenser (3) is connected with the exhaust outlet of steam turbine (2), the delivery port of described stram condenser (3) is connected to flow controller (18), described flow controller (18) is controlled respectively the hot water amount who enters air heat exchanger (5) and the built-in heater of fluidized bed dryer (10), the gas outlet of described air heat exchanger (5) connects fluidized bed dryer (10) fluidizing agent entrance, the gas vent of described fluidized bed dryer (10) connects deduster (14) and aerial condenser (15), the coal export of described fluidized bed dryer (10) is connected with the entrance of coal pulverizer (13), the delivery port of described air heat exchanger (5) and fluidized bed dryer (10) is connected with the water inlet of cooling tower (8).
2. a kind of system of utilizing the predrying brown coal of power station used heat and moisture to reclaim according to claim 1, it is characterized in that: on the pipeline being connected with the built-in heater of fluidized bed dryer (10) at the delivery port of stram condenser (3), the first waste heat exchanger (12) is set, on the pipeline being connected with fluidized bed dryer (10) fluidizing agent entrance in the gas outlet of air heat exchanger (5), the second waste heat exchanger (9) is set, described the first waste heat exchanger (12) and the second waste heat exchanger (9) are for utilizing other waste heat source of power station.
3. system claimed in claim 2 is utilized the method that the predrying brown coal of power station used heat and moisture reclaim, it is characterized in that: described steam turbine (2) steam discharge is after stram condenser (3) heat exchange, the recirculated water of stram condenser (3) outlet is divided into two parts: a part flows into air heat exchanger (5), air (7) is heated, and the air after heating is as the fluidizing agent of fluidized bed dryer (10); Another part recirculated water through the first waste heat exchanger (12) post bake laggard enter in the internal heater of fluidized bed dryer (10), for the dry run of brown coal raw material (11) provides heat, dried brown coal enter in coal pulverizer (13), enter cooling tower (8) as recirculated cooling water through the water of air heat exchanger (5) and the discharge of fluidized bed dryer (10) built-in heat exchanger; The air of fluidized bed dryer (10) discharge and water vapor mixture are after deduster (14) is removed bulky grain coal dust, gaseous mixture enters aerial condenser (15), air (16) is discharged from the top of aerial condenser (15), and condensed water (17) is comprehensive utilization from discharge aerial condenser (15) bottom.
4. method according to claim 3, is characterized in that: if also have other waste heat source in power station, by the first waste heat exchanger (12) and the second waste heat exchanger (9), water and air is heated again respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410213708.5A CN103983088A (en) | 2014-05-20 | 2014-05-20 | System and method for predrying lignite and recycling water by using waste heat of power station |
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| CN201410213708.5A CN103983088A (en) | 2014-05-20 | 2014-05-20 | System and method for predrying lignite and recycling water by using waste heat of power station |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105157398A (en) * | 2015-07-13 | 2015-12-16 | 华北电力大学 | Two-stage raw coal drying system and method applied to air cooling unit |
| CN106247367A (en) * | 2015-06-12 | 2016-12-21 | 三菱重工环境·化学工程株式会社 | Sludge incinerator |
| CN107764035A (en) * | 2016-08-18 | 2018-03-06 | 迪蔼姆芬兰有限公司 | For the method and arrangement recycled to the air in drying process |
| CN113883845A (en) * | 2021-10-19 | 2022-01-04 | 江苏慧朗能源科技有限公司 | Double-condensing box type dryer hopper |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106247367A (en) * | 2015-06-12 | 2016-12-21 | 三菱重工环境·化学工程株式会社 | Sludge incinerator |
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| CN107764035A (en) * | 2016-08-18 | 2018-03-06 | 迪蔼姆芬兰有限公司 | For the method and arrangement recycled to the air in drying process |
| CN113883845A (en) * | 2021-10-19 | 2022-01-04 | 江苏慧朗能源科技有限公司 | Double-condensing box type dryer hopper |
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Application publication date: 20140813 |